JS copy text to the clipboard

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<textarea cols="20" rows="10" id="biao1">用户定义的代码区域</textarea>
<input type="button" onClick="copyUrl2()" value="点击复制代码" />

function copyUrl2()
{
    var Url2=document.getElementById("biao1");
    Url2.select(); // 选择对象
    document.execCommand("Copy"); // 执行浏览器复制命令
    alert("已复制好，可贴粘。");
}